Save unpacked blender file
Since you don't need diff and merge functions, you could organize your files differently. You could create one or more scene files to be used as empty containers and link everything else. 

This way you would only commit real changes in linked objects and avoid to commit lots of unchanged binary data.
You can easily switch back and forth·between your scene files to the linked ones using the Edit Linked Library addon.

Related:


Wiki Linked_Libraries
Re-Import obj and replace existing
diff and version manage blender work
Moving a Linked Library